Clear the cache in JavaScript

Question

How do I clear a browsers cache with JavaScript   We deployed the latest JavaScript code but we are unable to get the latest JavaScript code   Editorial Note  This question is semi-duplicated in the following places  and the answer in the first of the following questions is probably the best   This accepted answer is no longer the ideal solution   How to force browser to reload cached CSS JS files   How can I force clients to refresh JavaScript files    Dynamically reload local Javascript source   json data

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If you are using php can do     lt script src  js myscript js rev  lt  php echo time     gt       type  text javascript  gt  lt  script gt

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You can call window location reload true  to reload the current page   It will ignore any cached items and retrieve new copies of the page  css  images  JavaScript  etc from the server   This doesn t clear the whole cache  but has the effect of clearing the cache for the page you are on   However  your best strategy is to version the path or filename as mentioned in various other answers   In addition  see Revving Filenames  don   t use querystring for reasons not to use  v n as your versioning scheme

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put this at the end of your template   var scripts    document getElementsByTagName  script    var torefreshs     myscript js    myscript2 js        list of js to be refresh var key   1     change this key every time you want force a refresh for var i 0 i lt scripts length i         for var j 0 j lt torefreshs length j            if scripts i  src  amp  amp   scripts i  src indexOf torefreshs j    gt  -1            new src   scripts i  src replace torefreshs j  torefreshs j     k     key            scripts i  src   new src     change src in order to refresh js

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or you can just read js file by server with file get contets and then put in echo in the header the js contents

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I had some troubles with the code suggested by yboussard   The inner j loop didn t work   Here is the modified code that I use with success   function reloadScripts toRefreshList   list of js to be refresh     key    change this key every time you want force a refresh           var scripts   document getElementsByTagName  script        for var i   0  i  lt  scripts length  i              var aScript   scripts i           for var j   0  j  lt  toRefreshList length  j                  var toRefresh   toRefreshList j               if aScript src  amp  amp   aScript src indexOf toRefresh   gt  -1                     new src   aScript src replace toRefresh  toRefresh     k     key                      console log  Force refresh on cached script files  From      aScript src     to     new src                  aScript src   new src

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You can also force the code to be reloaded every hour  like this  in PHP     lt  php echo   lt script language  JavaScript  src  js myscript js token   date  YmdH      gt      gt    or   lt script type  text javascript  src  js myscript js v  lt  php echo date  YmdHis      gt   gt  lt  script gt

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window location reload true  seems to have been deprecated by the HTML5 standard  One way to do this without using query strings is to use the Clear-Site-Data header  which seems to being standardized

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Cause browser cache same link  you should add a random number end of the url   new Date   getTime   generate a different number   Just add new Date   getTime   end of link as like call   https   stackoverflow com questions php     new Date   getTime     Output  https   stackoverflow com questions php 1571737901173

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window parent caches delete  call     close and open the browser after executing the code in console

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Cache delete   can be used for new chrome  firefox and opera

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I tend to version my framework then apply the version number to script and style paths   lt cfset fw version    001    gt   lt script src   scripts  fw version  foo js   gt

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You can t clear the cache with javascript  A common way is to append the revision number or last updated timestamp to the file  like this   myscript 123 js   or  myscript js updated 1234567890

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I found a solution to this problem recently  In my case  I was trying to update an html element using javascript  I had been using XHR to update text based on data retrieved from a GET request  Although the XHR request happened frequently  the cached HTML data remained frustratingly the same  Recently  I discovered a cache busting method in the fetch api  The fetch api replaces XHR  and it is super simple to use  Here s an example          async function updateHTMLElement t                let res   await fetch url   cache   quot no-store quot                 if res ok                   let myTxt   await res text                    document getElementById  myElement   innerHTML   myTxt                           Notice that  cache   quot no-store quot   argument  This causes the browser to bust the cache for that element  so that new data gets loaded properly  My goodness  this was a godsend for me  I hope this is helpful for you  too  Tangentially  to bust the cache for an image that gets updated on the server side  but keeps the same src attribute  the simplest and oldest method is to simply use Date now    and append that number as a url variable to the src attribute for that image  This works reliably for images  but not for HTML elements  But between these two techniques  you can update any info you need to now  -

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Please do not give incorrect information  Cache api is a diferent type of cache from http cache   HTTP cache is fired when the server sends the correct headers  you can t access with javasvipt   Cache api in the other hand is fired when you want  it is usefull when working with service worker so you can intersect request and answer it from this type of cache  see ilustration 1   ilustration 2 course  You could use these techiques to have always a fresh content on your users    Use location reload true  this does not work for me  so I wouldn t recomend it  Use Cache api in order to save into the cache and intersect the request with service worker  be carefull with this one because if the server has sent the cache headers for the files you want to refresh  the browser will answer from the HTTP cache first  and if it does not find it  then it will go to the network  so you could end up with and old file Change the url from you stactics files  my recomendation is you should name it with the change of your files content  I use md5 and then convert it to string and url friendly  and the md5 will change with the content of the file  there you can freely send HTTP cache headers long enough    I would recomend the third one see

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Try changing the JavaScript file s src  From this    lt script language  JavaScript  src  js myscript js  gt  lt  script gt    To this    lt script language  JavaScript  src  js myscript js n 1  gt  lt  script gt    This method should force your browser to load a new copy of the JS file

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Maybe  clearing cache  is not as easy as it should be  Instead of clearing cache on my browsers  I realized that  touching  the file will actually change the date of the source file cached on the server  Tested on Edge  Chrome and Firefox  and most browsers will automatically download the most current fresh copy of whats on your server  code  graphics any multimedia too   I suggest you just copy the most current scripts on the server and  do the touch thing  solution before your program runs  so it will change the date of all your problem files to a most current date and time  then it downloads a fresh copy to your browser    lt  php     touch   www control file1 js        touch   www control file2 js        touch   www control file2 js      gt       the rest of your program     It took me some time to resolve this issue  as many browsers act differently to different commands  but they all check time of files and compare to your downloaded copy in your browser  if different date and time  will do the refresh   If you can t go the supposed right way  there is always another usable and better solution to it  Best Regards and happy camping

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I ve solved this issue by using ETag Etags are similar to fingerprints  and if the resource at a given URL changes  a new Etag value must be generated  A comparison of them can determine whether two representations of a resource are the same

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Other than caching every hour  or every week  you may cache according to file data   Example  in PHP     lt script src  js my script js v  lt   md5 file  js my script js    gt   gt  lt  script gt    or even use file modification time    lt script src  js my script js v  lt   filemtime  js my script js    gt   gt  lt  script gt

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You can also disable browser caching with meta HTML tags just put html tags in the head section to avoid the web page to be cached while you are coding testing and when you are done you can remove the meta tags    in the head section    lt meta http-equiv  Cache-Control  content  no-cache  no-store  must-revalidate    gt   lt meta http-equiv  Pragma  content  no-cache    gt   lt meta http-equiv  Expires  content  0   gt    Refresh your page after pasting this in the head and should refresh the new javascript code too   This link will give you other options if you need them http   cristian sulea net blog disable-browser-caching-with-meta-html-tags   or you can just create a button like so   lt button type  button  onclick  location reload true   gt Refresh lt  button gt    it refreshes and avoid caching but it will be there on your page till you finish testing  then you can take it off  Fist option is best I thing

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Here s a snippet of what I m using for my latest project   From the controller   if   IS DEV          this- gt view- gt cacheBust   microtime true     else        this- gt view- gt cacheBust   file exists  versionFile              The version file exists  encode it           urlencode  file get contents  versionFile               Use today s year and week number to still have caching and busting            date  YW        From the view    lt script type  text javascript  src   javascript somefile js v  lt     this- gt cacheBust    gt   gt  lt  script gt   lt link rel  stylesheet  type  text css  href   css layout css v  lt     this- gt cacheBust    gt   gt    Our publishing process generates a file with the revision number of the current build   This works by URL encoding that file and using that as a cache buster   As a fail-over  if that file doesn t exist  the year and week number are used so that caching still works  and it will be refreshed at least once a week   Also  this provides cache busting for every page load while in the development environment so that developers don t have to worry with clearing the cache for any resources  javascript  css  ajax calls  etc

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Ref  https   developer mozilla org en-US docs Web API Cache delete Cache delete   Method Syntax  cache delete request   options   then function found         your cache entry has been deleted if found

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try using this     lt script language  JavaScript  src  js myscript js  gt  lt  script gt    To this     lt script language  JavaScript  src  js myscript js n 1  gt  lt  script gt

[javascript] Clear the cache in JavaScript

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